The flatworm red planaria Convolutriloba retrogemma is only 2 mm in length - but look how handsome it is!
It not only glows in the dark, but also illuminates the bottom under it like a flashlight.
C. retrogemma, like many other flatworms, contains dangerous toxins to scare off predators, and in case of death it can secrete these toxins. This is harmful to their neighbors, such as corals and fish - and even to humans if they consume infected fish.
